This is not difficult to find differing opinions on this subject. According to Paul Roberts, a conversion to renewable energy sources is not realistic. “In truth, much of the fault lies in the new energy technologies themselves, which simply cannot yet compete effectively with fossil fuels.” (Roberts, 2004, Para 19) However, the era of cheap oil is almost certainly at the end with the price of a barrel of oil going for 80.20 to 104.08 on the Stock Market. The price of oil continues to climb quickly and relentlessly. Global oil production will be soon hit a ceiling and drop, even as the demand continues to rise. The result will be an extremely large energy cost, political instability, and an uncertain energy future. The fact is many countries with the largest oil fields build in decade old and had in bad condition. Another fact is that fossil fuel use causes global warning. Scientists haves gathered an unassailable amount of evidence to conclude the warming of the planet had caused mainly by greenhouse gas emissions from burning fossil fuel. When many people use gas in a car the result is major amount pollution. When use hydrogen, the only product is water vapor. “Hydrogen can produce from diverse domestic resources, with the potential for near-zero greenhouse gas emissions.” (U.S Department of Energy, 2011) “Natural gas had been produced both worldwide and domestically at relatively low cost and is cleaner burning than gasoline or diesel fuel. Natural gas vehicles show an average reduction in ozone-forming emissions-80% compared to gasoline vehicles.” (California Energy Commission, 2002-2011) “Propane or liquefied petroleum gas (LPG) is a clean-burning fossil fuel. LPG-fueled vehicles produce fewer toxic and smog-forming air pollutants.” (California Energy Commission, 2002-2011.) By that has been said, alternative fuel vehicles can compete effectively with fossil